Import USB + éditeur complet + widgets

- Service USB watcher (polling montages, scan photos récursif)
- Écran accueil avec détection USB live (bouton vert + compteur)
- Éditeur : crop interactif avec overlay/grille des tiers
- Éditeur : filtres Pillow (N&B, sépia, vintage, contraste)
- Éditeur : stickers/goodies draggable + cadres overlay
- Éditeur : multi-pose (5 templates, remplissage auto)
- Éditeur : texte éditable draggable
- Éditeur : rotation, annulation, export scène PNG
- Widget CropOverlay avec poignées tactiles
- Widget GoodiesPanel (stickers + cadres depuis assets/)
- Widget MultiposeDialog (prévisualisation templates)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/ui/screens/home_screen.py

@@ -6,12 +6,15 @@ from PyQt6.QtWidgets import (
 from PyQt6.QtCore import Qt
 from PyQt6.QtGui import QFont
 
+from services.usb_watcher import UsbWatcher
+
 
 class HomeScreen(QWidget):
     def __init__(self, main_window):
         super().__init__()
         self.main_window = main_window
         self._setup_ui()
+        self._setup_usb_watcher()
 
     def _setup_ui(self):
         layout = QVBoxLayout(self)
@@ -29,6 +32,13 @@ class HomeScreen(QWidget):
         subtitle.setAlignment(Qt.AlignmentFlag.AlignCenter)
         layout.addWidget(subtitle)
 
+        # Status USB
+        self.usb_status = QLabel("")
+        self.usb_status.setFont(QFont("", 14))
+        self.usb_status.setAlignment(Qt.AlignmentFlag.AlignCenter)
+        self.usb_status.setStyleSheet("color: #4CAF50;")
+        layout.addWidget(self.usb_status)
+
         # Boutons d'import
         buttons_layout = QHBoxLayout()
         buttons_layout.setSpacing(20)
@@ -40,10 +50,12 @@ class HomeScreen(QWidget):
             ("Email", "Recevoir par mail", self._import_email),
         ]
 
+        self.buttons = {}
         for label, desc, callback in modes:
             btn = self._create_mode_button(label, desc)
             btn.clicked.connect(callback)
             buttons_layout.addWidget(btn)
+            self.buttons[label] = btn
 
         layout.addLayout(buttons_layout)
 
@@ -61,11 +73,54 @@ class HomeScreen(QWidget):
             QPushButton:pressed {
                 background-color: #1976D2;
             }
+            QPushButton:disabled {
+                background-color: #9E9E9E;
+            }
         """)
         return btn
 
+    def _setup_usb_watcher(self):
+        self.usb_watcher = UsbWatcher(self)
+        self.usb_watcher.usb_inserted.connect(self._on_usb_inserted)
+        self.usb_watcher.usb_removed.connect(self._on_usb_removed)
+        self.usb_watcher.start()
+        self._usb_photos = []
+        self._usb_mount = None
+
+    def _on_usb_inserted(self, mount_path, photos):
+        self._usb_mount = mount_path
+        self._usb_photos = photos
+        count = len(photos)
+        self.usb_status.setText(f"Clé USB détectée — {count} photo{'s' if count != 1 else ''}")
+        self.buttons["USB"].setStyleSheet("""
+            QPushButton {
+                background-color: #4CAF50;
+                color: white;
+                border-radius: 15px;
+                padding: 20px;
+            }
+            QPushButton:pressed { background-color: #388E3C; }
+        """)
+
+    def _on_usb_removed(self, mount_path):
+        if mount_path == self._usb_mount:
+            self._usb_mount = None
+            self._usb_photos = []
+            self.usb_status.setText("")
+            self.buttons["USB"].setStyleSheet("""
+                QPushButton {
+                    background-color: #2196F3;
+                    color: white;
+                    border-radius: 15px;
+                    padding: 20px;
+                }
+                QPushButton:pressed { background-color: #1976D2; }
+            """)
+
     def _import_usb(self):
-        self.main_window.show_import()
+        if self._usb_photos:
+            self.main_window.import_screen.set_photos(self._usb_photos)
+            self.main_window.show_import()
 
     def _import_wifi(self):
         self.main_window.show_import()